Dispensing gun



Sept. 13, 1938. .1. M. WALLAQE DISPENSING GUN Filed March 15,

Patented Sept. 13, 1938 UNITED STATES PATENT OFFiCE Application March15,

'1937. Serial No. 131,045

In Canada March 19, 1936 2 Claims.

It has been proposed to treat the inside of inher tubes of pneumatictires with a semi-plastic or viscous material having the character ofmaintaining said condition and tending to seal the tube against airleaks due to the rubber becoming porous or through punctures.

It is important that the tubes be supplied with the treating material inproperly measured quantities, and it is the object of my invention tode- 0 vise apparatus for positively and accurately dis pensing thematerial to the tubes, and particularly to devise apparatus which may beoperated by air pressure from air supply systems such as used forblowing up tires.

tions hereinafter described and illustrated in the accompanying drawingin which Fig. 1 is a longitudinal section through the apparatus;

Fig. 2 an end elevation of the same; and

Fig. 3 a cross section on the line 22 in Fig. 1.

In the drawing like numerals of reference indicate corresponding partsin the difierent figures.

l is a cylindrical casing or body having a head 2 at one end and abottom 3 at the other end. Slidable within the body is a plunger 4, therod 5 of which extends through a hole in the head 2 and is provided witha cross bar 6 or other suitable hand grip. A boss 1 is formed on thehead surrounding the hole for the plunger rod, which boss is formed withan internal seat to receive packing 8, which may be compressed by meansof a nut 9 threaded on the boss.

The plunger 4 comprises a pair of metal plates l0 and H between which isclamped a disk I2 of rubber or other suitable material. The parts of theplunger are held together by screws or bolts l3. One of the plates,preferably the upper one I D, is formed with an annular rib II] toposition the disk I2.

Interposed between the end of the body and the bottom is a Washer ordisk M of suitable packing material, to prevent leakage.

The top 2 is formed at opposite sides with pairs of lugs l5 betweenwhich are pivoted rods IS, the free ends of which are threaded and arereceived between corresponding pairs of lugs I! on the bottom 3. Wing orthumb nuts it are provided on the rods I6 which may be screwed upagainst the lugs I! to hold the bottom in place.

The bottom 3 is provided with an outlet ill to which is connected oneend of a hose 20, the other end of which is provided with a suitablenozzle 26 adapted to be fitted to a tire tube valve.

As it is desired, as stated in the preamble of the specification toutilize air pressure to operate the plunger, I provide in the head 2 anair inlet 2| to which may be connected a compressed air supply such asused for inflating tires.

I attain my object by means of the construo' In the plunger 4 is formeda passage 22, which is controlled by a valve 23, normally held in closedposition by a spring 24 secured to the plunger. The stem 25 of the valveextends through the passage 22 and extends a distance below the lowerside of the plunger for a purpose which will hereafter appear.

The device is used as follows. The plunger is moved to its upperposition, the bottom 4 removed, and a measured quantity of the treatingmaterial placed in the body. The bottom 4 is then replaced, and thenozzle 26 secured to the valve of the tube to be treated. The air supplyconnection is then connected with the inlet 2| and upon the air enteringabove the plunger, the latter is moved in the body to expel the treatingmaterial. As the plunger reaches the bottom of the body, the stem 25 ofthe valve engages the bottom 4 thus unseating the valve, thus relievingair pressure in the body and helping to expel any treating material leftin the hose.

The same procedure will take place for each tire tube to be treated.

From the above description, it will be seen that I have devised adispensing gun which will permit the operation of its plunger by airpressure and provided with convenient means for relieving air pressureand clearing the connections when the contents have been emptied fromthe body.

While the gun has been devised primarily for inserting treating materialin pneumatic tire tubes, it will be apparent that it may be used forVarious other purposes.

What I claim as my invention is:

1. Ina dispensing gun, the combination of a hollow body having an airinlet in one end and a discharge outlet in its other end; a plungermovable in said body; a pull rod connected with the plunger centrallythereof and extending through the other end of the body, said plungerhaving an air passage therethrough; a normally seated valve controllingsaid passage; a stem on said valve extending through said passage and ofa length to engage the end of the body to unseat the valve just as theplunger reaches the end of its stroke.

2. In a dispensing gun, the combination of a hollow body having an airinlet in one end and a discharge outlet in its other end; a plungermovable in said body; a pull rod connected with the plunger centrallythereof and extending through the other end of the body, said plungerhaving an air passage therethrough; a valve controlling said passage,spring means normally tending to hold said valve seated; a stem on saidvalve extending through said passage and of a length to engage the endof the body to unseat the valve just as the plunger reaches the end ofits stroke.

J. M. WALLACE.

